Comment # 17 on bug 1046158 from Adrian Schr�ter

An OBS admin could of course copy the key from one project to another one, but
the question is then if you don't break the idea of secure boot kernels. 

If you really want to copy the key, you need to copy on your source server the
_pubkey and _signkey file in /srv/obs/projects/$PROJECT.pkg/ . Afterwards you
need to generate the _sslcert using

 osc signkey --sslcert $project

or regenerate it if an old one is there using

 osc signkey --extend $project

However, I think it makes more sense just to disable the secure boot option as
this basically breaks the idea.